Short Range Order in Structural Models for the Amorphous Fe80B20- and Ni81B19-Alloys

The short range order in several structural models for amorphous alloys is investigated with respect to pair correlation functions, bond angle distributions and other properties. Despite of the different principles of modelling, the topological short range order turned out to be almost identical. Therefore also the question for the triplet correlations to some extent is found solved. Remaining differences thus consist regarding more complex correlations among the atoms.

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X-Ray Diffraction with Molten AuxMn100-x-Alloys

Zeitschrift für Naturforschung A ◽

10.1515/zna-1995-0907 ◽

1995 ◽

Vol 50 (9) ◽

pp. 831-836

Author(s):

R. M. Hagenmayer ◽

P. Lamparter ◽

S. Steeb

Keyword(s):

Correlation Functions ◽

Short Range ◽

Short Range Order ◽

Pair Correlation ◽

Diffraction Method ◽

X Ray Diffraction ◽

Pair Correlation Functions ◽

X Ray ◽

Structure Factors ◽

Total Structure

Abstract The molten alloys Au28.5Mn71.5 and Au68Mn32 are investigated with the energy dispersive X-ray diffraction method which works rather fast so that the evaporation loss of Mn from the molten alloys is kept low. From the observed prepeak follows that both melts are compound-forming but the gold rich melt Au68Mn32 shows only 50% of the short range order existent within the Au28.5Mn71.5 melt. Total structure factors and total pair correlation functions are discussed.

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Medium range order from total and partial pair correlation functions of Ni62Nb38and Ni65B35metallic glasses

Physica Scripta ◽

10.1088/0031-8949/46/2/014 ◽

1992 ◽

Vol 46 (2) ◽

pp. 185-188 ◽

Cited By ~ 2

Author(s):

E Sváb ◽

E J Hiltunen

Keyword(s):

Correlation Functions ◽

Pair Correlation ◽

Range Order ◽

Medium Range Order ◽

Pair Correlation Functions ◽

Medium Range

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Pb()O3-type Perovskites: Part I. Pair-correlation Theory of Order-disorder Phase Transition

Journal of Materials Research ◽

10.1557/jmr.1997.0284 ◽

1997 ◽

Vol 12 (8) ◽

pp. 2117-2126 ◽

Cited By ~ 11

Author(s):

Hyun M. Jang ◽

Su-Chan Kim

Keyword(s):

Long Range ◽

Order Parameter ◽

Short Range ◽

Short Range Order ◽

Pair Correlation ◽

Range Order ◽

Statistical Thermodynamic ◽

Range Order Parameter ◽

Long Range Order ◽

Short Range Order Parameter

The limitation of the long-range order parameter and the necessity of the short-range order parameter for the thermodynamic description of Pb()O3-type perovskites are discussed. Based on the discussion, a statistical thermodynamic model that takes into account the configuration of the neighboring B-site ions (B′ and B″ cations) was developed. A pair-correlation approximation was used in the calculation of the configurational entropy and the long-range coulombic interaction energy between the nearest B-site ions. The theoretical calculations using Pb(Sc1/2Ta1/2)O3 (PST) and Pb(Sc1/2Nb1/2)O3 (PSN) systems indicate that the short-range order parameter persists over a wide range of temperatures examined (0–1800 K) and that there possibly occur consecutive long-range order-disorder transitions in the configuration of B-site cations. The possibility of the existence of short-range ordering above the long-range order-disorder transition temperature was also examined using the annealed PSN specimen as a typical example of Pb()O3-type perovskites.

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